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Pinholes

Pinholes. Hothands , Papa J. Image Height vs. Object Distance. Purpose : Find the relationship between object distance and image height. Procedure: we moved the lightbulb (object) back by a predetermined amount, and then tested the affect this had on the image height. Hi= 1/Do *127.

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Pinholes

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  1. Pinholes Hothands, Papa J

  2. Image Height vs. Object Distance • Purpose: Find the relationship between object distance and image height Procedure: we moved the lightbulb (object) back by a predetermined amount, and then tested the affect this had on the image height.

  3. Hi=1/Do *127

  4. Image Height vs. Object Height • Purpose: Find the relationship between object height and image height Procedure: we varied the height of the object (changing the arrow) by a predetermined amount, and then tested the affect this had on the image height.

  5. Hi=Ho*.58

  6. Object Height vs. Image Distance • Purpose: Find the relationship between object height and image distance Procedure: we varied the distance from the hole of the image projection, and then tested the affect this had on the image height.

  7. Ho=Di*.15

  8. The important stuff Hi∝Ho Hi∝1/Do Hi∝Di Thus, by principle of joint variation Hi αHodi/do Hi = k Ho*di/do Where K is dimension and equal to one. Thus, HiDo=HoDi

  9. Multiple Pinholes/Enlarging the pinhole Multiple pinholes? Enlarging the pinhole?

  10. Enlarging the pinhole: Makes the image blurrier and brighter. Multiple pinholes: Produces a another image on the screen for each pinhole

  11. Our conclusions: The Ray model Because the fact that the image pictures flipped, we hypothesized that light rays move in straight lines. When we tried this model….

  12. Credit: http://motivate.maths.org/moodle/pluginfile.php/416/mod_resource/content/0/November/Images/pinholecamera2.gif

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